Ports: Update glu to 9.0.3

This necessitates a switch to the Meson build system. A nice side effect
of this is that we now build & install the shared library for glu as
well.

Ports/glu/patches/0002-Build-Do-not-hide-symbols-by-default.patch

@@ -0,0 +1,24 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Jelle Raaijmakers <jelle@gmta.nl>
+Date: Sun, 11 Feb 2024 23:47:48 +0100
+Subject: [PATCH] Build: Do not hide symbols by default
+
+For some reason, the functions glu exports end up as LOCAL entries in
+the shared library. Remove this default visibility to set them to
+GLOBAL.
+---
+ src/meson.build | 1 -
+ 1 file changed, 1 deletion(-)
+
+diff --git a/src/meson.build b/src/meson.build
+index 57d3b4a6163828445872f73ca4a92f2d202ac768..9ee969636950760354fb8990cc0bb7ea789098b5 100644
+--- a/src/meson.build
++++ b/src/meson.build
+@@ -103,7 +103,6 @@ libglu = library(
+     'libnurbs/nurbtess',
+     inc_include,
+   ],
+-  gnu_symbol_visibility : 'hidden',
+   dependencies : [dep_gl],
+   version : '1.3.1',
+   darwin_versions  : [ '5.0.0', '5.1.0' ],